基于单片机的数控恒流源设计

下载后可任意编辑本科毕业论文（设计）题目（中文）基于单片机的数控恒流源设计 a （英文）Design of constant current voltage source based on SCM 完成日期 2024 年 4 月摘要恒流源是一种高精度的电源，具有响应速度快，恒流精度高，能长期稳定工作，适合各种性质负载等优点，而具有了越来越广泛的应用。本文主要论述了一种基于51单片机为控制核心的数控直流源的设计与实现。本电源具有可预设电流，电流步进，显示电流的功能。主要由单片机控制模块、键盘输入模块、A/D转换模块、恒流源模块、D/A转换模块和显示模块六部分组成。系统由单片机设定预置电流信号，经过D/A转换器TLC5615输出模拟电压信号，该信号控制达林顿管的基极，使其集电极输出相应的电流。再通过A/D转换芯片，实时把采样电路上的模拟信号转换成数字信号，形成反馈，显示出实际的输出电流。关键词：压控恒流源；单片机；数控电源 Abstract Constant current source is a kind of common power source with high precision with fast response, high precision of constant current. It can also work stably for a long time and has various properties of the load. So now it is used more and more widely. This paper mainly discusses the design and implementation of a digital constant current source based on 51 MCU as the control core of the system. The power supply has a preset current, current step, current display function. It has 6 parts: Control module, keyboard module, A/D trans module, D /A trans module , display module and constant current source module. The current signal set by the SCM. Then it through D / A converter TLC5615 , which output to the voltage analog signal and control the Darlington tube base, and output the corresponding current. Finally through the A/D conversion chip, real-time sampling circuit analog signal is converted into digital quantity, feedback , show the actual output current. Keywords: voltage controlled constant current source; single chip microcomputer; digital power supply 目录上海师范大学本科毕业论文（设计）诚信声明 ………………………………… I 上海师范大学本科毕业论文（设计）选题登记表…………………………………II 上海师范大学本科毕业论文（设计）指导记录表…………………………………Ⅳ 中文摘要及关键词 ………………………………………………………………Ⅴ 英文摘要及关键词 ……………………………………………………………… Ⅵ 1 前言…………………………………………………………………………………1 1.1 讨论背景及意义………………………………………………………………1 1.2 国内外讨论现状………………………………………………………………1 2 基本原理与方案对比………………………………………………………………2 2.1 总体框图………………………………………………………………………2 2.2 恒流源方案对比………………………………………………………………3 2.2.1 晶体管恒流源……………………………………………………………3 2.2.2 场效应管恒流源…………………………………………………………4 2.2.3 集成电路恒流源…………………………………………………………5 2.2.4 总结………………………………………………………………………5 2.3 单片机简介……………………………………………………………………6 2.4 液晶显示屏简介………………………………………………………………8 2.5 数模转换芯片…………………………………………………………………9 2.6 模数转换芯片…………………………………………………………………9 3 各模块实现……………………………………………………………………… 10 3.1 键盘模块…………………………………………………………………… 10 3.2 液晶显示模块……………………………………………………………… 11 3.3 D/A转换模块…………………………………………………………………12 3.4 A/D转换模块…………………………………………………………………12 3.5 恒流源模块………………………………………………………………… 13 3.6 电路整体工作原理………………………………………………………… 14 4 系统软件实现…………………………………………………………………… 15 4.1 综述………………………………………………………………………… 15 4.2 键盘输入流程图…………………………………………………………… 16 4.3 A/D转换流程图………………………………………………………………17 4.4 D/A转换流程图………………………………………………………………18 4.5 液晶显示流程图…………………………………………………………… 19 5 整体测试与分析………………………………………………………………… 20 6 总结与展望……………………………………………………………………… 22 参考文献…………………………………………………………………………… 2